Civil Procedure – Res judicata – The doctrine of res judicata – Issue estoppel – The doctrine of issue estoppel – Whether the instant claim is a collateral attack on a previous order of the court – Whether the instant claim offends the doctrine of res judicata – Whether the claim offends the doctrine of issue estoppel – Whether the formalities for the sale of land have been satisfied in respect of the purported sale and purchase of the subject property – Intestates’ Estates and Property Charges Act, sections 2(1) and 4(1), Interpretation Act, section 41